diff --git a/src/motif/radiobox.cpp b/src/motif/radiobox.cpp
index 9076292ca0..ff0bed1a6e 100644
--- a/src/motif/radiobox.cpp
+++ b/src/motif/radiobox.cpp
@@ -133,8 +133,9 @@ bool wxRadioBox::Create(wxWindow *parent, wxWindowID id, const wxString& title,
     XtSetArg (args[0], XmNorientation, ((style & wxHORIZONTAL) == wxHORIZONTAL ?
                                           XmHORIZONTAL : XmVERTICAL));
     XtSetArg (args[1], XmNnumColumns, m_majorDim);
+    XtSetArg (args[2], XmNadjustLast, False);
 
-    Widget radioBoxWidget = XmCreateRadioBox ((Widget)m_mainWidget, "radioBoxWidget", args, 2);
+    Widget radioBoxWidget = XmCreateRadioBox ((Widget)m_mainWidget, "radioBoxWidget", args, 3);
 
     //    if (style & wxFLAT)
     //        XtVaSetValues (radioBoxWidget, XmNborderWidth, 1, NULL);